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September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
Technical Specification 018.01
WATER DISTRIBUTION SYSTEM
1.0 General
a) It is the intent of this specification to ensure that all water system infrastructure
constructed within the service area of the Brunswick County Public Utilities
Department meets or exceeds all local, state, and federal rules and regulations as
applicable. This specification also provides technical guidance to contractors
and engineers to ensure that all water system infrastructure is properly
constructed, tested, chlorinated, and placed in service to protect the public.
2.0 Materials and Requirements for Water Mains
a) General
1) To the maximum extent possible all materials shall be manufactured in the
United States. This includes all pipe, valves, fittings, hydrants, meter
boxes, etc.
2) All pipe material shall be marked with the manufacturer, type, class,
thickness, and date of production in lettering legible to the Engineer and
County staff.
3) The Engineer is responsible for reviewing all shop submittals for approval.
County Engineering may assist as needed to answer any questions
concerning material suitability.
4) All piping material must have a minimum pressure rating of one and one-
half (1.5) times the normal working pressure of the pipe.
5) All pipes, valves, hydrants, fittings, etc., must conform to the applicable
AWWA standards.
6) Water mains shall be constructed of AWWA C900 or C905, PVC,
minimum DR-18, except when DIP, HDPE, or Fusible PVC mains are
required.
7) All pipes shall be shipped with gaskets installed inside the pipe bell.
8) Water main installation shall conform to AWWA C600: Standard for
Installation of Ductile Iron Pipe (DIP), or AWWA C605: Standard for
Installation of Polyvinyl Chloride (PVC) pipe
b) Ductile Iron Pipe (DIP)
1) All sizes of pipe shall be manufactured to a nominal laying length of 18'-
0" to 20'-0”, except to make adjustments for bends, tees, and other fittings.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
2) DIP shall conform to ANSI / AWWA C150 / A21.50 and ANSI / AWWA
C151 / A21.51, with interior cement mortar lining and an exterior
asphaltic coating for corrosion resistance.
3) Cement mortar linings shall conform to ANSI A21.4 / AWWA C104.
4) DIP that has an interior lining of Protecto 401 (or equivalent) for use in
sewer systems shall not be permitted on potable water systems.
5) Joints shall be the push-on or mechanical joint type conforming to ANSI /
AWWA C111 / A21.11 as modified by ANSI / AWWA C151 /
A21.51.
6) Fittings and specials shall be cast or ductile iron conforming to ASNI
21.10 and shall be rated for one hundred and fifty (150) pounds per square
inch minimum pressure.
7) Wall thickness shall be in accordance with Table 51.1 of ANSI/AWWA
C151/A21.51 with working pressure of one hundred and fifty (150) psi.
Final pipe class shall be determined based on specific structural
calculations as they relate to conditions encountered during design.
Brunswick County reserves the right to designate the final pipe
thickness.
a) (4) inch – (12) inch diameter pipe: minimum pressure class 350
b) (14) inch – (20) inch diameter pipe: minimum pressure class 250
c) (24) inch pipe: minimum pressure class 200
d) Flanged pipe shall be minimum pressure Class 53
8) Rubber gaskets and lubricant shall conform to ANSI/AWWA
C111/A21.11.
9) No metric sized pipe shall be permitted.
10) In corrosive, contaminated, and dredged soils, DIP and all fittings shall be
wrapped in a polyethylene encasement per ANSI / AWWA A21.5 / C105
Polyethylene Encasement for Ductile Iron Piping for Water and Other
Liquids. All fasteners shall be stainless steel Type 304, minimum grade.
11) Acceptable products are American Cast Iron Pipe Company, Griffin Pipe
Company, U.S. Pipe Company, or approved equal.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
c) Polyvinyl Chloride Pipe (PVC)
1) All sizes of pipe shall be manufactured to a nominal laying length of 18'-
0" to 20'-0” except to make adjustments for bends, tees, and other fittings.
2) Two (2) inch PVC mains shall be SDR-21, gasketed pipe, in accordance
with ASTM D2241 and shall bear the seal of the National Sanitation
Foundation (NSF).
3) Four (4) inch through twelve (12) inch PVC mains shall be AWWA C900
Class 150 (DR-18) and shall bear the seal of the NSF. Joints shall
conform to ASTM D3139 or ASTM D3212.
4) Fourteen (14) inch through thirty-six (36) inch PVC mains shall be
AWWA C905 Class 235 (DR-18) and shall bear the seal of the NSF.
Joints shall conform to ASTM D3139 or ASTM D3212.
5) PVC mains shall be manufactured with PVC material conforming to PVC
1120.
6) Fittings shall be molded PVC with joints similar to the PVC pipe.
Fabricated fittings using solvent welded joints are not acceptable.
Fittings may also be DIP fittings listed and approved for use with PVC
pipe and shall have a cement mortar lining on the interior and an asphaltic
coating on the exterior for corrosion resistance.
7) All PVC water mains shall be factory dyed industry standard blue.
8) Push on joints shall conform to ASTM D3139 with an elastomeric gasket
and the joint pressure rating shall not be less than the pipe pressure
rating.
9) In corrosive, contaminated, and dredged soils, all fittings shall be wrapped
in a polyethylene encasement per ANSI / AWWA A21.5 / C105
Polyethylene Encasement for Ductile Iron Piping for Water and Other
Liquids. All fasteners shall be stainless steel Type 304, minimum grade.
10) Acceptable products are Diamond Plastics Corporation, J M Eagle
Manufacturing Company, National, Certainteed, North American, or
approved equal.
d) Fusible Polyvinyl Chloride (Fusible PVC)
1) Fusible PVC pipe shall be in the four (4) inch to thirty-six (36) inch
diameter range.
2) Fusible PVC shall be AWWA C900 (4 inch through 12-inch diameter) and
C905 (14 inch through 36-inch diameter) with National Sanitation
Foundation (NSF) certifications NSF– 61 and NSF – 14.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
3) Fusible PVC shall conform to ASTM cell classification 12454.
4) Fusible PVC shall have a minimum safety factor of (2.0).
5) Fusible PVC shall be joined by the thermal butt fusion method in
accordance with ASTM F-1674 and D-638.
6) Four (4) through twenty-four (24) inch Fusible PVC (DIPS) shall be
minimum DR-18.
7) Thirty (30) inch Fusible PVC (DIPS) shall be DR-25.
8) Thirty-six (36) inch Fusible PVC (DIPS) shall be DR-32.5.
9) All Fusible PVC water mains shall be factory dyed industry standard blue.
10) Fittings and specials shall be as stated in Section (4.0) of this
specification.
11) Acceptable products are Fusible PVC ™ by Underground Solutions, Inc.
e) High Density Polyethylene Pipe (HDPE)
1) HDPE mains shall be high density polyethylene conforming to AWWA
C906 with PE 3408 materials and shall conform to ASTM F714
specification for HDPE pipe.
2) HDPE shall be joined by the thermal butt fusion method in accordance
with ASTM D3261.
3) HDPE shall be minimum DR-9 rated at a minimum two hundred (200)
pounds per square inch.
4) All HDPE water mains shall have a factory standard blue stripe on the
pipe.
5) Fittings and specials for HDPE mains shall be per the HDPE
manufacturer’s recommendations and shall be submitted as shop
submittals by the utility contractor to the Engineer for review and approval
prior to use. All fittings and specials shall conform to ASTM D3350 for
fittings materials.
6) HDPE used for horizontal directional drills (HDD) shall have the pipe
diameter increased in order to maintain equivalent inside diameter as the
open cut installed pipe it connects to.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
7) Acceptable products are Mono-Line Pipe System by Joseph T. Ryerson
and Sons, Inc.; Driscopipe 1000 by Phillips Products, Inc.; Sclairpipe by
Dupont of Canada; JM Manufacturing Company Inc., or approved equal.
3.0 Materials and Requirements for Water Services
a) Water services that are less than fifty (50) percent of the outside diameter of the
supplying main may utilize a wide band body tapping saddle. All other
water service connections shall use a tapping sleeve.
b) (1) inch service lines and tapping saddles
1) Service line piping shall be minimum one (1) inch diameter for (3/4) and
(1) inch water meters and shall be HDPE tubing, SDR 9, 200 psi,
conforming to ASTM D2737 / AWWA C901. No joints are allowed on a
service line between the main service tap and the meter stop.
In proven contaminated soils the service line shall be Type K copper
with rated and approved gaskets for contaminated soils.
2) Service saddles shall be wide band body service saddles, ACIPCO, US
Pipe, McDonald, Mueller, Smith Blair, Ford, JCM, Romac, or approved
equal. All fasteners shall be minimum high strength alloy steel.
3) Size of tap shall match that of the service line (1-inch minimum tap).
4) The corporation stop shall have AWWA inlet threads, ball type, outlet
connection to be CTS /OD, conductive compression type (grip nut). Size
of corporation stop shall match that of service line (1-inch minimum).
Corporation stops shall be Mueller B 25028, Ford –Ball Corp FB 1100 or
1000, McDonald – Ball Corp 4704 –BT, or approved equal.
c) (1.5) inch and (2) inch service lines and tapping saddles
1) Services shall be two (2) inch diameter for one and one-half (1.5) inch and
two (2) inch water meters and shall be HDPE tubing, SDR 9, 200 psi,
conforming to ASTM D2737 / AWWA C901. No joints are allowed on a
service line between the main service tap and the meter stop.
In proven contaminated soils the service line shall be Type K copper
with rated and approved gaskets for contaminated soils
2) Service saddles shall be wide band body service saddles, McDonald 3800
series, Mueller H 13000 or DR 2S series, Smith Blair 317, Ford FC 202,
JCM 406, Romac 202, or approved equal. All fasteners shall be
minimum high strength alloy steel.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
3) Tapping valve shall be a two (2) inch, resilient wedge gate valve, Mueller
A 2360, or approved equal, installed with a valve box and concrete collar
per County Standard Detail.
4) Large meter boxes with meter setters are required for one and one-half
(1.5) inch and two (2.0) inch water meters and shall be provided by the
contractor and shall accommodate the Sensus AMR/AMI water meter. The
contractor shall submit the proposed large meter box and lid to the
Engineer for approval prior to installing the meter box.
d) (3) inch and (4) inch service lines
1) Service lines shall be four (4) inch diameter for three (3) inch and four (4)
inch water meters and may be HDPE, DIP, or PVC material conforming to
technical specifications for these materials per Section (3.0) of this
Specification. Water meters three (3) inch and larger shall be installed in a
meter vault per County Water Standard Details – Large Meter Vaults.
2) Tapping sleeves are required per County Standard Details. Tapping
saddles are not allowed on any services larger than two (2) inch. See
Section (12) of this specification for tapping sleeve information. All
fasteners shall be minimum high strength alloy steel.
e) Services for water meters larger than four (4) inch shall be sized to match the
installed meter size.
f) All services shall be installed as shown on the approved plans and the tap shall be
made perpendicular to the main and run straight to the meter box or vault.
Variations from this requirement due to field conditions are only by approval of
the County in advance of installation.
g) Locating wire is required on water services and water mains. See Section (14) of
this specification for locating wire information.
h) Service taps shall be made at the 10:00 o’clock or 2:00 o’clock position on the
water main. Service taps shall be staggered from one side of the main to the other
with a minimum distance of eighteen (18) inches between taps. Taps are to be a
minimum twenty (20) inches apart if made on the same side of the main.
i) Services shall not be installed by the contractor until all the mains have passed
hydrostatic testing, cleaning, and chlorination results are satisfactory and provided
to County staff.
j) No taps are allowed on a fire hydrant leg.
k) No taps are allowed where rodding is in place.
l) No burned taps are allowed.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
m) No taps are allowed on horizontally directionally drilled (HDD) pipe.
n) Brunswick County Public Utilities is standardizing on the Sensus AMR / AMI
water meter. Water meters shall be Sensus AMR / AMI, or approved equal, and
shall be provided with the MXU unit and touch read pad.
o) Water meter boxes for standard 5/8” x 3/4'” water meters shall be:
Single Meter Boxes:
Ford LYLV141-243-TP-NL
McDonald 776-208PC2G437
Mueller H-1462-K
1) Or approved equal – all boxes must accommodate the Sensus water meter
with AMI/AMR technology to include the MXU unit and touch read pad
2) Water meter boxes for meters larger than 5/8” x 3/4” shall be provided by
the contractor and sized appropriately for the meter being installed
Double Meter Boxes:
1) Or approved equal – all boxes must accommodate (2) Sensus ¾-inch water
meters with AMI/AMR technology to include the MXU units and touch read
pad.
p) All new residential subdivisions that have county public sewer shall install a
double water meter box on the one (1) inch service lateral on each lot to
accommodate an irrigation meter for separate billing purposes.
q) Large water meter vaults shall be per the County Standard Details for meter
vaults. Quazite or GlasMasters polymer concrete enclosures, minimum Tier 22
rating for both the box and lid, are an approved “or equal” to a standard concrete
vault. Contact County Engineering with any questions concerning large water
meter vaults.
4.0 Materials and Requirements for Fittings and Specials
a) Fittings and specials shall be class (54) ductile iron per ANSI / AWWA A21.11 /
C111, ANSI / AWWA A21.53 / C153, and ANSI / AWWA A21.51 / C151,
minimum class 350 for (18) inch and smaller fittings and minimum class 250 for
(20) inch and larger fittings.
b) Profiles of fittings and specials may have special dimensions as required by the
pipe manufacturer.
Ford
DGHC118-C14439-002-NL
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
c) Ductile iron fittings and specials shall be cement mortar lined per ANSI / AWWA
A21.4 / C104 and have an asphaltic coating on the exterior for corrosion
resistance.
d) No metric sized fittings shall be permitted.
e) All fittings to be shipped with gaskets, glands, nuts, and bolts unless specified
otherwise. Nuts and bolts shall be high strength alloy steel.
5.0 Materials and Requirements for Restrained Joints, Piping, and Fittings
a) Restrained joints are required to prevent movement of system piping caused by
forces in or on buried piping, tees, valves, branches, bends, plugs, etc.
b) Restrained joints shall be installed as shown on the approved plans, standard
details, or as directed by county staff or the Engineer.
c) Concrete thrust blocking shall be installed as shown on the approved plans,
standard details, or as directed by county staff or the Engineer.
d) All carrier pipe installed inside a casing shall be pressure class 350 ductile iron
pipes per county standard details with restrained joints.
e) All restrained joint systems shall have a pressure rating equal to or greater than
that of the pipe on which they are installed.
f) Restraint type gaskets that provide internal restraint by means of stainless steel
inserts embedded within the gasket are not permitted for use in Brunswick
County.
g) Ductile Iron Pipe (DIP)
1) Install restraints in strict accordance with the manufacturer’s
recommendations.
2) All ductile iron horizontal directional drill and bore-and-jack installations
shall use boltless, integral, positive locking restraint systems that allow for
joint deflection and disassembly should the need arise. The restrained
joint system shall be a manufacturer’s standard restrained joint system
such as American (Flex-Ring or Lok-Ring), U S Pipe (TR-Flex), or
Griffin (Snap-Lok), or approved equal.
Note: the aforementioned boltless, integral, positive locking restraint
systems are also acceptable for use in open cut pipe installations.
3) External bell restraint harness shall have ductile iron glands. The
dimensions of the gland shall be such that it can be used with the standard
mechanical joint bell. Twist off nuts with preset factory torque setting
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
shall be used to ensure proper actuation of the restraint device. All nuts,
bolts, and fasteners shall be high strength alloy steel. Mechanical joint
restraints shall conform to ANSI/AWWA A21.11/C111 and
ANSI/AWWA A21.53/C153, latest revision.
The restrained joint system shall be a manufacturer’s standard restrained
joint system manufactured by EBAA Iron, Inc., Smith-Blair, Inc., JCM,
Inc., or approved equal.
4) Restraint for valves and fittings shall have ductile iron glands. Twist off
nuts with preset factory torque setting shall be used to ensure proper
actuation of the restraint device. All nuts, bolts, and fasteners shall be
high strength alloy steel. Mechanical joint restraints shall conform to
ANSI/AWWA A21.11/C111 and ANSI/AWWA A21.53/C153, latest
revision.
The restrained joint system shall be a manufacturer’s standard restrained
joint system manufactured by EBAA Iron, Inc., Smith-Blair, Inc., JCM,
Inc., or approved equal.
5) Stainless steel rodding and fasteners, Type 304 minimum, is acceptable
per county standard details. Manufacturer’s restraint system and/or glands
are preferred in lieu of rodding.
h) Polyvinyl Chloride Pipe (PVC)
1) Install restraints in strict accordance with the manufacturer’s
recommendations.
2) External bell restraint harness shall have ductile iron glands. The
dimensions of the gland shall be such that it can be used with the standard
mechanical joint bell. Twist off nuts with preset factory torque setting
shall be used to ensure proper actuation of the restraint device. All
nuts, bolts, and fasteners shall be high strength alloy steel.
Mechanical joint restraints shall conform to ANSI/AWWA A21.11/
C111 and ANSI/AWWA A21.53/C153, latest revision.
The restrained joint system shall be a manufacturer’s standard restrained
joint system manufactured by EBAA Iron, Inc., Smith-Blair, Inc., JCM,
Inc., or approved equal.
3) Restraint for valves and fittings shall have ductile iron glands. Twist off
nuts with preset factory torque setting shall be used to ensure proper
actuation of the restraint device. All nuts, bolts, and fasteners shall be
high strength alloy steel. Mechanical joint restraints shall conform to
ANSI/AWWA A21.11/C111 and ANSI/AWWA A21.53/C153, latest
revision.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
The restrained joint system shall be a manufacturer’s standard restrained
joint system manufactured by EBAA Iron, Inc., Smith-Blair, Inc., JCM,
Inc., or approved equal.
4) Stainless steel rodding and fasteners, Type 304 minimum, is acceptable
per county standard details. Manufacturer’s restraint system and/or glands
are preferred in lieu of rodding.
6.0 Materials and Requirements for Pipe Couplings – 4 inch and larger
a) Provide couplings where needed to make piping connections.
b) Provide full-length, mechanical joint, ductile iron solid sleeve with twelve (12)
inch minimum length.
c) Provide ductile iron cut-in sleeve with mechanical restrained joints where
installing fittings in an existing line.
7.0 Materials and Requirements for Fire Hydrants
a) Hydrants shall be the dry barrel type with breakaway flange, shall open left only,
conforming to AWWA Standard C502, latest revision, with a six (6) inch
mechanical joint connection on the inlet end, minimum four and one-half (4.5)
inch valve opening, and two (2.5) inch hose connections and one (4.5) inch
pumper connection, all with American National Standard fire hose coupling
threads.
b) Hydrants shall have breakaway barrel and operating stem with barrel length for
three (3) foot main cover, six (6) inch bottom hub, and one and one-half (1.5) inch
solid operating nut with O-ring seals.
c) Main valve seat shall have bronze to bronze threads into the hydrant shoe.
Hydrant shall be grease lubricated with a thrust bearing to reduce operating torque
or may be oil lubricated.
d) Hydrants shall be rated at one-hundred –fifty (150) psi working pressure and
three-hundred (300) psi test pressure.
e) Hydrants shall be shop painted chrome yellow Tnemenc paint (or approved equal)
and shall be touched up after installation and given one (1) field coat of chrome
yellow enamel. If the hydrant is painted with color other than chrome yellow
from the manufacturer, there shall be three (3) field coats of chrome yellow paint
applied by the contractor after installation.
f) Hydrant shall be dry bonnet type and be provided with a drain outlet for draining
when the valve is closed and shall be provided with washed stone per County
Standard Detail to ensure adequate drainage.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
g) All fire hydrants installed on water mains 12-inch and smaller shall be installed as
shown on County Standard Detail W-1 using a swivel hydrant tee on the main and
DIP and/or MJ GradeLok restrained joint (Mega-A-Lug or equal) piping between
the hydrant gate valve and the hydrant. Mega-A-Lug is preferred in lieu of
rodding. Thrust blocks are required per detail.
h) All fire hydrants installed on water mains larger than 12-inch shall be installed
with a level invert tee on the main and DIP and/or MJ GradeLok restrained joint
(Mega-A-Lug or equal) piping between the hydrant gate valve and the hydrant.
Mega-A-Lug is preferred in lieu of rodding. Thrust blocks are required per detail.
i) Hydrants shall be installed plumb one-eight (1/8) inch per foot, and set so that the
pumper nozzle is eighteen (18) inches minimum above the final finished grade.
j) Contractor shall be allowed one (1) barrel extension as required to maintain
pumper nozzle at eighteen (18) inches above final finished grade and the fire
hydrant shall not be left too high such that the breakaway will not work properly.
k) Hydrants shall be Mueller, Clow, American Darling, or approved equal.
8.0 Materials and Requirements for Building Fire Sprinkler Systems
a) Backflow prevention devices are required on all fire lines and sprinkler systems to
prevent cross- contamination of the County’s water transmission and distribution
system. Refer to the Brunswick County Public Utilities Department’s Cross-
Connections and Backflow Protection Policy for additional information.
b) A lockable post indicator valve (PIV) is required at the right-of-way or easement
line on all fire lines to delineate ownership of the fire line between the
County and the property owner. The top of the PIV shall be thirty-six (36)
inches above finished grade. Refer to County Standard Details for fire lines.
c) Backflow prevention devices shall be installed at the right-of-way or easement
line immediately adjacent and downstream of the PIV. With County approval the
backflow prevention device may be installed inside a building’s mechanical room
where the sprinkler riser is located.
e) Where a building utilizes a sprinkler system, or has a Fire Department Connection
(FDC), then the required level of backflow protection is a Reduced Pressure Zone
(RPZ) backflow preventer.
f) Fire hydrants shall not be installed on private fire lines.
9.0 Materials and Requirements for Water System Valves
a) General Information for all Valves
1) Valves shall be installed on all system branches from feeder mains, on
hydrant legs, at each end of horizontal directional drills per standard
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
detail, per a), b) and c) as follows, or as directed by county staff or the
Engineer:
a) Install three (3) valves at crosses
b) Install two (2) valves at tees
c) Install one (1) valve on a fire hydrant leg
2) For distribution mains isolation valves are required at approximately every
one-hundred (100) feet per one (1) inch diameter of the installed main up
to a maximum distance of two thousand (2,000) feet between valves. For
example, for an eight (8) inch diameter main install a main line isolation
valve every eight hundred (800) feet. Place mail line isolation valves in
close proximity to fire hydrants. Also adjust main line isolation valve
placement to take into account subdivision entrances, driveways, fences,
street intersections, other underground utilities, etc, or as directed by
county staff. Restrained joint pipe is required on the first joint in each
direction from a main line valve as per county standard detail
3) For transmission mains - defined as twelve (12) inch and larger - install an
isolation valve approximately every two hundred (200) feet per one (1)
inch diameter of the installed main up to a maximum distance of five
thousand (5,000) feet between valves. Place main line isolation valves in
close proximity to fire hydrants. Also adjust main line isolation valve
placement to take into account subdivision entrances, driveways, fences,
street intersections, other underground utilities, etc, or as directed by
county staff. Restrained joint pipe is required on the first joint in each
direction from a main line valve per county standard detail.
4) Place main line isolation valves on the downstream side of the fire hydrant
tee per the direction of water flow.
5) Valves shall be located per the approved plans, at the proper elevation, and
operable. Hard to operate or inoperable valves and fire hydrants are not
acceptable and shall be repaired or replaced prior to system hydrostatic
pressure testing.
6) All valves shall open left – no right hand open valves are allowed.
7) Valves shall be rodded to the cross or tee if within ten (10) feet of the
cross or tee.
8) All valves shall have a metal screw type valve box with lid marked
WATER and a concrete collar (in non-traffic areas) installed per the
County Standard Detail for valves and valve boxes. Masonry blocking
shall be used to support the valve box such that it does not rest on the
bonnet of valve – refer to county standard details. Valve lid shall be
painted blue.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
9) Maximum depth of the valve stem nut shall be five (5) feet. If valve stem
nut is deeper than five (5) feet below grade then a valve operating nut
extension kit, manufactured by the same company that produced the valve,
must be installed by the utility contractor.
b) Gate Valves
1) All valves shall be in conformance with the latest revision of all reference
standards of AWWA C509 / 515: “Resilient Seated Gate Valves for Water
Supply Service”.
2) Four (4) inch through twelve (12) inch mains: use resilient wedge gate
valves or ¼ turn stainless steel ball valves. No valves smaller than four
(4) inch diameter are allowed.
3) All valves shall open left (counter clock wise) – no right hand valves
allowed.
4) Valves shall have a two (2) inch metal operating nut with arrow indicating
direction of opening.
5) Valves shall be designed for a working pressure of not less than one
hundred fifty (150) psi unless specifically approved by county staff or the
Engineer.
6) Valves shall be equipped with a non-rising stem. Valves installed in
vaults or manholes shall be provided with hand wheel actuators.
7) All valves shall have a screw type valve box and a four (4) inch thick
concrete collar in non-traffic areas per county standard detail.
8) Resilient Seated Wedge Gate Valves:
a) Iron body, bronze mounted, double disc, parallel seat type, factory
tested to three hundred (300) psi, valve ends to be constructed for
use with mechanical joints or push on joints.
b) Bonnet and body flanges shall be fully machined to assure proper
sealing of the gasket.
c) Shall have O-Ring sealed stems with one O-Ring located below the
thrust collar and with two O-Rings located above the thrust collar.
The thrust collar between the two lower O-Rings shall be factory
filled with a lubricant to provide permanent lubrication of the thrust
collar area.
d) Provide integrally cast bronze or stainless steel thrust collar.
September 2017 Brunswick County Engineering Department Revision 1.10
TS 018.01
e) An antifriction thrust washer shall be provided both above and
below the thrust collar for ease of operation.
f) Acceptable product: Mueller, M & H, American Flow Control,
Clow, or approved equal.
c) Butterfly Valves
1) Butterfly valves shall be installed on water mains sixteen (16) inch
diameter and larger.
2) Butterfly valves shall meet the requirement of AWWA C504, latest
revision.
3) Valves shall have mechanical joints.
4) Operating stem and nut shall be two (2) inch and open left only.
5) Resilient and elastomer seats are to be synthetic rubber (EPDM).
6) Shafts to be turned, ground and polished, constructed of 18-8 Type 304
stainless steel.
a) Shafts to be of one piece design.
b) Attach disc to shaft with stainless steel tapered pins and locking
nuts.
7) Provide operators with not less than maximum operator torque, as
determined in accordance with Appendix A of AWWA C504, to operate
valves under actual line pressures and velocities:
a) Provide worm and gear, or traveling nut type, self-locking to
prevent the valve disc from creeping or fluttering when it is in any
intermediate position between open and closed.
b) Gear operators to be permanently lubricated, totally enclosed, with
adjustable stops for the open and closed position.
c) All exterior fasteners shall be minimum high strength alloy steel.
8) Epoxy coated inside and outside conforming to AWWA C550.
9) Rated for a one hundred fifty (150) psi working pressure.
10) Acceptable product: Mueller, American Darling, Pratt, or approved equal.
d) Tapping Valves – less than 30 inches
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1) Tapping valves smaller than thirty (30) inches shall conform to the
following:
a) Resilient seated wedge type conforming to AWWA C509 / C515.
b) Epoxy coated inside and outside conforming to AWWA C550.
c) Both ends shall be flanged with tapping boss by mechanical joint
conforming to ANSI B16.1, Class 125 and ANSI / AWWA
C111 / A21.11 respectively.
d) Rated for two hundred fifty (250) psi working pressure.
e) All exterior fasteners shall be minimum high strength alloy steel
f) Acceptable Product: Mueller T-2360 -16, AVK Series 25, or proved
equal.
e) Tapping valves (30) inches and larger
1) Bronze seat, double disk type, conforming to AWWA C500, or resilient
seated wedge conforming to AWWA C515.
2) Epoxy coated inside and out conforming to AWWA C550.
3) Equipped with four (4) inch by-pass valves.
4) Ends shall be flanged with tapping boss by mechanical joint conforming to
ANSI B16.1, Class 125 and ANSI/AWWA C111/A21.11 respectively.
5) Rated for (200) psi working pressure.
6) Acceptable product: Mueller t-2360 -16, AVK Series 25 or approved
equal.
10.0 Materials and Requirements for Valve Boxes and Concrete Collars
a) Install per county standard details at each water valve.
b) Cast iron or ductile iron, screw type, with flared base, length as required for the
buried valve, Valve Box Adaptor II, by Adaptor Inc., or approved equal.
c) The word “WATER” shall be cast in the cover.
d) The contractor shall spray paint the cover blue after installation.
e) Install precast concrete ring around valve box in unpaved non-traffic areas per
county standard detail.
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11.0 Materials and Requirements for Valve Markers
a) Valve markers shall be installed in rights-of-way and utility easements as shown
on the County Standard Details
b) Valve markers in public rights-of-way shall be concrete, extend thirty-six (36)
inches above finished grade, with the cast MV (main valve), AV (air release
valve), or BO (blow off) facing the nearest street. Valve markers in utility
easements shall be fiberglass and extend sixty (60) inches above finished grade.
Refer to county standard details for additional information.
c) Valve markers are not required for fire hydrant leg isolation valves.
d) Valve markers shall be painted blue for water mains.
e) Concrete valve markers shall have a bronze, stamped, insert on top of marker per
county standard detail.
12.0 Materials and Requirements for Tapping Sleeves (services larger than 2 inch)
a) Tapping sleeves shall have outlet flange counter bored to accept a mating tapping
valve for true alignment of the tapping sleeve, tapping valve, and tapping
machine.
b) Sleeves shall be stainless steel, split type, with gasket and flanged outlet.
c) Sleeve fasteners shall be minimum high strength alloy steel.
d) Provide for a minimum working pressure of one hundred fifty (150) psi.
e) Provide (¾) inch NPT test plug on the tapping sleeve.
f) Air test of tapping sleeve – minimum fifty (50) psig for five (5) minutes - shall be
witnessed by county staff prior to the contractor performing tapping
operations on county water mains. No taps are allowed without county staff
present.
g) Acceptable tapping sleeves are:
1) Romac, Ford, and Mueller for mains four (4) inches through twenty-four
(24) inches diameter.
2) Dresser, Cascade, and JCM for mains thirty (30) inches and larger.
13.0 Materials and Requirements for Curb Stops and Water Meter Boxes
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a) All new residential subdivisions that have public sewer shall install a double
water meter box on each lot to accommodate an irrigation meter.
b) See Section 3.0 (o) of this specification for approved water meter boxes.
c) All single gang water meter boxes will have an in-line curb stop valve and an in-
line check valve per county standard detail.
d) All irrigation meters, and all non-residential water meters, must have an approved
backflow prevention device installed per county standard detail.
e) Brunswick County is standardizing on the Sensus AMR / AMI water meter. All
water meter boxes used in the service area of Brunswick County Public Utilities
must accommodate the Sensus AMR / AMI water meter.
14.0 Materials and Requirements for Locating Wire, Marking Tape, and Marker Balls
a) Tape shall be three (3) inches wide, blue in color, bearing continuous message
“CAUTION WATER LINE BURIED BELOW”. Tape shall be made of plastic or
other permanent material, and shall be buried continuously above the water main
at a depth of eighteen (18) inches below finished grade.
b) All water mains shall have a #12 AWG, high strength copper clad steel conductor
(HS-CCS) such as Copperhead Superflex, or approved equal, with HDPE
insulation, and rated for direct burial. Listed and approved underground
connectors shall be used for all splices. The wire shall be brought up in valve
boxes per County Standard Detail. In any event, the wire shall be brought up into
a valve box at 1,000 feet maximum intervals to provide wire access points. The
wire shall be taped to the top of the water main at minimum ten (10) feet
intervals.
c) The contractor shall be required to perform a signal strength test of the installed
tracer wire at the end of the project with county staff present. Refer to county
standard details for tracer wire information.
d) Individual water services shall have tracer wire installed from the main to the
meter box.
e) In addition to the tracing wire, electronic marker balls shall be installed on the
water main in accordance with Brunswick County Technical Specification TS
035.01: Electronic Markers for Water and Sewer Pressure Mains.
15.0 Separation of Water Mains and Sewer Mains
a) Horizontal and Vertical Separation
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1) Minimum horizontal separation between water mains and sanitary sewer
shall be ten (10) feet. The distance shall be measured edge of pipe to edge
of pipe.
2) Should ten (10) foot separation not be feasible, then the water main may
be located closer to the sewer main provided that:
a) It is laid in a separate trench,
b) It is laid in the same trench with the water main located at one side
on a bench of undistributed earth,
c) In either of the above cases, crown elevation of the sewer shall be
at least eighteen (18) inches below invert elevation of the water
line.
3) Sewers crossing water mains shall be laid to provide a minimum vertical
separation of eighteen (18) inches between the invert of the water main
and the crown elevation of the sewer main. The crossing shall be arranged
perpendicularly so that the sewer main joints will be equidistant and at
least ten (10) feet from the crossing in each direction.
4) If it is impossible to maintain the required horizontal and vertical
separation as described above or anytime sewer must be laid above a water
main then both the water main and sewer main must be constructed of
pressure class 350 ductile iron pipe with watertight joints and pressure
tested to (150) psi to assure water tightness before backfilling. At the
discretion of Brunswick County a ferrous sleeve may be installed around
existing water mains and force mains to meet this requirement provided
DENR approval for the ferrous sleeve is first obtained by the Engineer.
5) Mechanical joints will be required for the transition in the sewer main at
water main / sewer main crossings. Fernco couplings are not permitted to
be used. Special structural support for the water and sewer mains may be
required.
16.0 Hydrostatic Testing
a) Conduct hydrostatic testing in accordance with AWWA C600 (DIP) or AWWA
C605 (PVC) as applicable. Conduct tests on each line or valved section of line.
Water mains shall be tested to one-hundred and fifty (150) percent of the pipe
working pressure, but in no case shall the hydrostatic test pressure be less than
(150) psig for a minimum of two (2) hours and shall be witnessed and certified by
county staff and / or the Engineer.
b) Slowly fill the main in order to expel air from the main through the air release
valves, fire hydrants, blow offs, or other appurtenances. If permanent air release
valves are not located at all high points, the contractor shall install corporation
cocks at such points so that air can be expelled as the line is filled with water.
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After all the air has been expelled, the corporation cocks shall be closed and the
test pressure supplied. At the conclusion of the pressure test, the corporation
cocks shall be removed and plugged.
c) Hydrostatic pressure testing shall not be made until seven (7) days after
installation of piping to be tested is backfilled, and a minimum forty-eight (48)
hour notice to county staff is required.
d) Directionally drilled pipe may be pressure tested after any manufacturer’s
required pipe relaxation period, as applicable, in order to ascertain the successful
completion of the directional drill. All directionally drilled piping shall be tested
again with the system as a whole and witnessed by county staff and /or the
Engineer.
e) A suitable test pump, furnished by the contractor, shall be connected to the line by
means of a tap in the line, or other suitable methods, and the proper test pressure
slowly applied to the line.
17.0 Water Main Flushing and Chlorination
a) Conduct disinfection in accordance with AWWA C651 and 15A NCAC 18C
.1003 before placing a newly installed water main in service:
1) Upon completion of construction thoroughly flush the water main to
remove all sediment, stone, and other foreign matter.
2) Hydrostatically pressures test the water main per Section (16) of this
specification.
3) The water main shall be disinfected by the addition and thorough
dispersion of a chlorine solution in concentrations sufficient to produce a
chlorine residual of at least fifty (50) milligrams per liter (or ppm) in the
water throughout the water main system.
4) All installed valves or other appurtenances shall be operated several times
while line is filled with chlorinating agent to ensure proper filling of the
entire system.
5) The chlorine solution shall remain in contact with the interior surfaces of
the piping system for a minimum period of twenty-four (24) hours.
6) At end of retention period flush the system with potable water. At least
(10) ppm of chlorine shall remain in the water at the extreme end of the
system.
7) If the initial disinfection procedure fails to produce satisfactory laboratory
results the system must be disinfected again as needed by the contractor
until satisfactory results are obtained.
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8) Originals of the laboratory test results shall be provided to county staff.
b) Acceptance:
1) Provide separate samples for each sample location free of coliform
bacteria:
a) Contractor shall submit water samples to an approved laboratory
for testing.
b) Contact County Engineering or Public Utilities for assistance and
verification of sampling – a minimum forty-eight (48) hour notice
is required.
c) The sample results shall include the free chlorine residual at the
time the samples were collected.
d) All sample locations are to be given an identifying label.
e) The certified laboratory results shall indicate the absence of
coliform bacteria in the water samples.
2) At a minimum, sample locations shall be as required by NCDENR and the
following:
a) The tie-in location of new and existing water lines.
b) The end of all dead-end lines.
c) At intervals of no more than (1,200) feet for all new lines longer
than (1,200) feet in length.
c) Disposal of Chlorinated Water
1) The contractor is cautioned that the spent chlorine solution must be
disposed of in such a way as not to be detrimental to animal, plant, or fish
life.
18.0 Operation of Brunswick County Water System Valves and Fire Hydrants
a) No county valves or hydrants shall be operated by the contractor without prior
approval of county staff.
b) All hydrant and blow-off operations shall be done in a manner so that private
property is not impacted and there shall be no flooding of streets, driveways, or
roadways or any other traffic problems created.